Top box key end stuck in the bottom of the lock barrel, any ideas?

[Skippernick]

I had the same problem on a Givi box where the key snapped off in the lock. Tried tweezers without success then as last resort put a tiny spot of superglue on the end of the broken key and carefully pushed against the broken bit within the lock. Gave it 30 seconds or so to bond and withdrew the key carefully. Worked a treat.

Thats how is would do it too.